In this single dose study, people with epilepsy taking AEDs, but not currently taking the test medication, lamotrigine, will be studied. We will use an order-randomized three-sequence six-period replicate design with the two most disparate generics studied in two replicate periods each and the brand (reference) product studied in two additional periods. A standard single dose of the test drug (lamotrigine 25mg) will be administered under controlled conditions (fasting with subsequent standardized meals) with a 12-hour in-facility blood sample collection followed by a collection every 24 hours for a total of a 96 hour sample collection that will be used to establish the pharmacokinetic measures of Cmax, AUC96 and AUC∞. Each period will be separated by at least a 12 day washout interval.